Listening Mode - Pin

Continuing the discussion from Setup WiFi on Photon without using iOS Setup Library:

Setup Mode - Use the 'Setup' button - this is available via a pad on the underside of the pcb.

Sorry for not reading through the whole other thread, but you can enter Listening mode via software too.
https://docs.particle.io/reference/firmware/photon/#wifi-listen-

But for this

Yes, the solder pad underneath the SETUP button provides access to the respective µC pin.